Air filter



FIG. 1 is a perspective view of a air filter in the present design.

FIG. 2 is a right view of a air filter in the present design.

FIG. 3 is a top view of a air filter in the present design.

FIG. 4 is a front view of a air filter in the present design.

FIG. 5 is a bottom view of a air filter in the present design.

FIG. 6 is a left view of a air filter in the present design; and,

FIG. 7 is a rear view of a air filter in the present design.

The ornamental design for an air filter, as shown and described.